Pinwheel



Aug. 11, 192s.

o. JUNGHANS PINWHEEL Fed Nov. 14. 1924 Jrgj.

Patented Aug, 11, 1925.

USKARJ'UNGHANS, OIE SCHRAMBERG, GERMANY.

PINWHEEL.

Application filed November 14, 1924. Serial No. 749,971.

To all whom t may concern: I

Be it known that l, @sinn JUNoHANs, a citizen of the German Republic,residing at Schramberg, Germany, have invented certain new and usefulimprovements in Pinwheels, of which the following is a specification.

My invention relates to pin-wheels and more particularly to theconstruction of pin-wheels for clockworks.

Pin-wheels of this type usually comprise a hub, two spaced disksintegral with said hub and located vertically and in parallelismthereon, and pins inserted into and between the two disks in asymmetrical sequence or order. The pins commonly consist of highlypolished steel wire and upon having been inserted into correspondingholes of the two disks they must be fixed in their positions which maybe done either by riveting, punching, caulking or in any other suitablemanner of laterally compressing or engaging the visible ends of the pinsso that they will be firmly enrbedded in the two wheels.

Recently pin wheels of the kind are manufactured by casting underpressure and if the pins are not attached to the wheel during and by thecasting operation, they must be inserted in the usual old manner, thatis to say, they must be fixed in their positions by riveting, punchingor the like in order to prevent the pins from accidentally slipping out.

Fin-wheels made by way of casting under pressure have an unpleasantappearance due to the grey colour of the casting metal and itisdesirable to improve the outer appearance of the cast pieces bygalvanization. The wheels, however, cannot be galvanized ei;- eept priorto the insertion of the polished steel pins, for otherwise the hard andsmooth polished surfaces of the pins would be impaired and roughenedwhich must be avoided for frictional regards, and further salts woulddeposit in the narrow spaces between the ends of the pins and thesurfaces of the holes in which they arel supported, and such salts wouldsubsequently come forth and make stains on the wheels.

For the above reasons it is imperative to insert and fix the pins in thewheels after galvanization. This, however, cannot be done in the usualmanner and with the aid of means as hitherto employed for fixing thepins in the wheels, since the electro-plated coat would be destroyed orda-inagedthereby and the appearance of the damaged coat would be veryunpleasant.

Considering these conditions I avoid, in accordance with my invention,all and any destruction or damaging of the electro-plated surfaces ofthe wheels and with this purpose in viewl fix the pins in the wheels bymeans of small ridges or lips provided at the rim or edge of eachindividual hole of the wheel. To this end the ridges or lips are, afterthe electro-plating operation and after the pins have been inserted,bent and flattened over the end of the inserted pin by means of anyappropriate pressing` tool so as to fill the pin hole at its outer endand hold the pin in place. 1fn this way each pin will be fixedindividually in its holes or supports without any liability of theelectro-plated surfaces being damaged or torn.

l/Vith the stated objects in view my invent-ion consists in thecombination and ar rangement of parts, as will be hereinafter more fullydescribed, shown in the accompanying drawings forming a part of thisspecification, and particularly pointed out in the appended claims itbeing understood that changes in the form, proportion, size, and minordetails may be made within the scope of the claims without departingfrom the spirit or sacrificing any of the advantages of the invent-ion.

In the drawings Figure l is a side or end view of a pin-wheelconstructed according to my invention and Figures 2 and 3 are sectionson the line A-B of Figure l; Figure 2 showing the state of the wheelwithout any pins inserted, and Figure 3 illustrating the condition ofthe wheel with the pins inserted and fixed.

ln the embodiment shown the pinwheel comprises an elongated hub h withthe steel shaft or arbor e projecting at the two ends thereof, twospaced disks a and (l integral with the hub /i and pins Z) supported bythe two disks so as to be in equidistant and parallel relationship toeach other.

As will be seen in Figures l and 2 the disk t has a number of say sixholes f which, as usually, are diametrically opposed and parallel toeach other and to the aXis of the arbor e. On the outer face of the disk(L small ridges or lips o are provided, two of said lips bordering theouter end or edge of each hole f, so as to abruptly coincide with theinner face of the hole, but gently declined towards the outei` face ofthe disk a. In lieu of tWo ridges or lips c three or more may beprovided or an annular projection may surround the outer end of eachhole f instead to serve the like purpose as the ridges or lips. It goesWithout mentioning that While the holes f are complete pei't'orations,the corresponding holes g of the other disk ci do not extend fullythrough the Whole of the thickness of the disk d but are mere boreshaving a bottom for the pin to abut against.

As above stated the pin Wheel must be galvanized prior to the insertionof the pins. After galvanization the pins cut the proper length areinserted and the lips c are pressed, by means 0f a suitable pressing dieor the like, over and into the holes f so that the latter will be closedand the pins prevented from slipping out, as clearly shown in Figure 3.

lVhat I claim is z- A pin-Wheel comprising aA hub, two spaced disksrigidly connected With the said hub and having a number of parallelholes, alined and equidistant from each other, a pin in each pair ofcorresponding holes7 and projections on the end face of the one disk forclosing the holes and fixing the pins in place therein.

In testimony whereof I signature.

affixed OSKAR JUNGHANS.

